Before coming to have a personal relationship with Jesus, I used to think I was an atheist and even joked that I always wanted to retire somewhere warm...I also used to think I was a good person.
"Personal relationship"? :sarcastic
I helped people, I obeyed the laws, I was a good son, brother, friend etc., but by my own standards. Looking at porn wasn't an issue since it was out there for the looking or downloading. Getting drunk didn't seem like a big deal either or lusting.
You still judge yourself by your own standards; it's just that those standards have changed.
That's not to say that I have been able to rid myself of these sins either. But, knowing these things are wrong, you have a greater desire to overcome these issues.
See... I don't understand this viewpoint. IMO, I have major reason to try to overcome negative things without God. I've got quite a number of ideas about how I want the world to be and how I want to be myself, and I think that when it comes right down to it, the responsibility falls on me: if I want to see change, I'll either need to do it myself or convince someone else to do it. I have no invisible gods or spirits I can rely on to pick up the slack if I don't do my share.
I think that belief in God, especially the sort of God preached by Christianity, would strip my kind of motivation away: suddenly, my vision for how the world should be is undermined, because I'd now believe that there's some other, better vision for how things should be (a.k.a. "God's plan"), and I should make my own vision secondary to that one. At the same time, I'd lose my sense of responsibility: no matter what I do, Christ will still come down and make everything perfect. My own actions will have no ultimate effect on the outcome of anything that truly matters.
On top of that, I feel like Christianity strips away personal responsibility: not only (as I touched on before) will the physical consequences of misdeeds be erased by Jesus, my very guilt for things I've done is forgiven. Without God, the effects of your actions, whether good or bad, are on your own shoulders as long as you live. I think this creates a significant incentive to make sure you do things right the first time.
So... given all that, how does your faith give you
greater desire to do good? It seems to me that mainstream Christianity would actually undermine every reason I personally have for doing good.
Yeah, I was a good person, but only by my own point of view. We are so sunk if atheists are going to be setting the moral codes...
As opposed to the theists, who have done such a bang-up job for the past few millenia, right?
Sounds pretty bigoted to me and the atheists may as well join those Islamic extremists who want to make the whole world Muslim, they seem to share the same mentality.
You presume quite a bit in this post. The OP presented us with a hypothetical atheist society and asked us what we thought it would be like. Nobody's said anything about actually wanting to
impose an atheist society on anyone.